Genetic susceptibility and environmental factors of esophageal cancer in Xi’an

Table 1 Risk factors for esophageal cancer

Risk factors		Case	Control	OR	OR95%CI	χ2	P
Tobacco smoking	Yes	70	38	2.04	1.15-3.60	6.88	0.009
	No	59	63
Alcohol drinking	Yes	50	16	3.45	1.74-6.91	15.08	0.000
	No	77	85
FHEC	Yes	27	8	3.14	1.28-7.94	7.67	0.006
	No	100	93
GSTM1	Deletion	74	44	1.81	1.03-3.18	4.85	0.028
	Existed	53	57
CYP1A1	Ile/Ile	21	31	1.00
	Ile/Val	56	48	1.72	0.83-3.58	2.50	0.114
	Val/Val	50	22	3.35	1.49-7.61	10.33	0.001

FHEC: family history of esophageal cancer.